Agitating device



W. LINDSAY.

AGITATING DEVICE. APPLICATION FILED OCT. 21. 191B.

Patented Jan. .20, 1920.

UNITED STATES PATENT OFFICE.

WILLIAM LINDSAY, OF CHICAGO, ILLINOIS.

AGITATING DEVICE.

Specification of Letters Patent. Patented J an, 20, 192

Application flIed October 21, 1918. Serial No. 259,100.

in the diiferent figures indicate like parts.

- My invention has for its object to provide improved means foragitating movable structures, such, for example, as sifting devices forsifting molders sand, flour, enameling or other powder, or otherwisetreating by agitation, any comminuted or liquid material requiring suchtreatment, by combining.

with a freely movable structure, suspended or otherwise supported, an"electric motor mounted upon said structure, said motor having anecoentrica-lly weighted, or unbalanced rotary field and a stationaryarmature to enable a relatively large circle'of movement to bedescribed, all of which is hereinafter more articularly described anddefinitely set forth in the claims.

In the drawings,

Figure 1 is an elevation of a sifting device embodying the features ofmy invention,

Fig. 2 is an enlarged central vertical sectional view in detail of themotor and casing,

Fig. 3 is a like view, partly broken away, showing a modified form ofmotor, and

Fig. 4, is a diagrammatic plan view of the motor field-casing taken onthe line 44, Fig; 2. i

' The drawings illustrate one form of application of my invention.

Referring thereto, 1 indicates generally, a frame consisting of aplurality, preferably three, of metallic tubes 2, tapped into andextending radially from a central cylindrical member 3, the constructionand purpose of which will be hereinafter explained. The tubes 2 areextended horizontally and thence upwardly, as shown, and finally benttoward each other so as to be connected by means of hollow sleeve-nuts5, to a central hollow casting or suspending-member 6, having a ring, orother suspending member 7, by means of which it maybe loosely suspendedin mid f til upon a cord or chain 8, or otherwise.

The contiguous ends of the tubes 2 are tapped as shown, into the centralcasting or,

member 3, which forms a cap for a dependmg cyllndrical protective casing9. The upper edge of the part. 9 is fitted Within a depending flange 1O,formed upon the periphcry of the part 3, and hermetically sealed orotherwise constructed, so as to form an air tight chamber within thecasing which is in free communication with the hollow space Within thetubes 2. The cylindrical casing is rigidly secured to the cap by meansof a central bolt or member 11, then per end of which is tapped as showninto a oss 12, formed upon said cap, While the lower end is caused toprotrude through the bottom of the casing and is provided with a nut 13to hold the casing in place. The part 11, is stationary in its relationto the casing and forms an armature support for the winding 14, of astationary armature.

An electric cable 15, in communication with a source of electricalenergy is threaded through an opening in the part 6, care being taken toseal or close the space around it to prevent the admission of air ordust,

, and thence through one of the tubes 2, where one of its terminals isconnected with an insulated metallic rlng 16, and the other with a likering 17. A brush 18, upon the motor casing 19, is connected by means ofa lead 20, to the winding 21 of the motor. The field-casing 19 isrotatably mounted by means of rings and ball-bearings 22 and 23, so asto revolve around the stationary armature 14. A lead 24 serves toconnect the brush 18 with a commutator brush 25 in operative contactwith a. commutator 26 upon the armature. A counterpart brush 27 isconnected by means of a lead 28, with a brush 29, contacting with thering 17. The field-pole also communicates with said brush by means of alead 30.

While the motor described is of the direct current type, of well knownconstruction, it differs from motors in common use in the fact that thefield is made to rotate around a stationary armature, the latter beingin rigid connection with the structure tobe agitated. In order to impartan eccentric or gyratory movement to the field, and hence to thestructure, 1 cause the former to be weighted eccentrically to its axis.This, it is manifest, may be accomplished in diiferent Ways- In theexample i11ustrated, I have shown as being rigidly attached to or formedupon the periphery of p the field-casing 19, a curved weight or memment,which, in turn, is imparted to the structure, the extent of eccentricitydepending upon the relative weights of the parts and the speed at whichthe motor is driven.

The device shown is represented as applied to an ordinary sieve having aframe orv wall 32, Fig. 1, and a sieve or riddle 33. The sieve frame.may means of lugs 34 attached to the tubes 2, and a clamping-screw 35.

In Fig. 3, I have shown a series motor adapted for use in connectionwith an alternating current, in which laminated fieldpoles 36 aresubstituted for the windings shown in the other. The unbalanced weight31 is attached to'or formed upon the casing in the same manner, and thegyratory action is the same as that of the structure indicated in theother views. i

I do not limit myself to the exact con- ,struction'show-n, inasmuch asit maybe varied without departing from the principle involved in theinvention which is applicable to any freely movable structure howeversupported or suspended.

Having thus described my invention, I

claim:

1. An agitating device in which is combined a freely supported movablestructure,

and an electric motor mounted thereon, said motor having a rotaryunbalanced field.

2. An agitating device comprising, in combination, a structure supportedto permit free lateral movement thereof in all directions, and a motormounted thereon having be held in place byv neeaere structure having anelectric motor thereon provided with an unbalanced rotary field.

i the field is rotated.

6. An agitating device, comprising, in combination, a structure freelysuspended by flexible means to permit a gyratory movement thereof, anelectric motor having its field-casing rotatably mounted upon saidstructure upon an axis concentric with that of said structure, saidmotor having a stationary'. armature, a rotary fieldcasing, and anunbalanced weight upon the periphery of saidfield-casing.

7. An agitating device comprising, a freely movable structure, anelectric motor having a field-casin journaled in said structure, astationary a mature in rigid concentric axial relation to said casing, arotary field, and a weight upon said casing eccentric to its axis.

8. In a gyratory structure, the combination, with a movably supportedelement to .thereon the armatureof which is rigidly attached thereto,said motor having aneccentrica'lly' weighted rotary field. Y

In testimony whereof, I have signed this specification in the presenceof two subscribing witnesses, this 18th day of October, "1918.

' WILLIAM LINDSAY. Witnesses:

"DAVID H. FLETeHER, lrIAnnr I. Crooner.

